隔夹层成因、分布及其对油水分布的影响——以准噶尔盆地腹部莫索湾莫北地区为例

Origin and distribution of interbeds and the influence on oil-water layer:An example from Mosuowan area in the hinterland of Junggar Basin

准噶尔盆地莫索湾莫北地区三工河组二段主要的沉积相类型为三角洲前缘亚相,发育泥质、钙质、物性3类隔夹层,其成因类型和控制因素各不相同。根据测井响应特征可以识别出钙质、泥质隔夹层。该区隔夹层以泥质隔夹层为主,钙质隔夹层为辅,主要受沉积微相的控制,同时也受后期成岩作用与断裂构造的联合控制。研究结果表明,隔夹层较差的孔渗性与封堵性影响油水在储层中的分布,易形成油水同层现象。

The main sedimentary facies type of J1 s22 is delta front subfacies in northern Mosuowan area of Junggar Basin,where developed three types of interbeds：muddy,calcareous and physical,with various origins and controlling factors.According to logging response characteristics,the calcareous and muddy interbeds can be identified.The main interbed in this area is muddy interbed with some calcareous interbed,and it is mainly controlled by sedimentary facies,as well as the later diagenesis and faulted structure.The low porosity and permeability and sealing effect of interbeds control the oil-water distribution in the formation,which easily causes oil-water layer phenomenon.